See the case of Ganymede(Rosalind) and Orlando.When Orlando is distressed(because he had not met Rosalind since the wrestling match),he meets Ganymede,a fairly youth,who is actually Rosalind herself.Now Ganymede asks Orlando to visualise him(her)as his mistress.And further in the play Ganymede pretends to be Rosalind and behaves with him as his lady-love,by asking Orlando to come in time at his(her)cottage and woo her everyday.He(she) also tells him to call him(her) "Rosalind" and behave as the same way he would behave with his mistress.Read the last part of ACT III SCENE II AND ACT IV SCENE 1